ENERGY-SAVING BULBS SHOULD BE USED………ELECTRICITY .A.SAVE B.SAVING C...

39. - TRAC NGHIEM TONG HOP NGU PHAP CUC AN TUONG
TRAC NGHIEM TONG HOP NGU PHAP CUC AN TUONG

39.Energy-saving bulbs should be used………electricity .

A.save

B.saving

C.to save

D.to saving